Preserving cursor position about zsh-history-substring-search HOT 4 OPEN

In zsh, to remember the cursor position for each history entry and recall it 
each time you recall a history entry, you'd add to your ~/.zshrc:

typeset -A cursor_history
save-cursor()    cursor_history[$HISTNO]=$CURSOR
restore-cursor() CURSOR=${cursor_history[$HISTNO]-$CURSOR}

autoload -Uz add-zle-hook-widget
add-zle-hook-widget line-finish      save-cursor
add-zle-hook-widget history-line-set restore-cursor

(note that that history is not preserved between shell invocations, only within 
the current shell session).

It also doesn't save the current cursor position when you leave the currently 
edited line. For that, you'd also need to wrap at least all history motion 
widgets so they do a save-cursor first:

for w (${(Mk)widgets:#.*hist*}) {
  functions[${w#.}]='save-cursor; zle '$w
  zle -N ${w#?}
}